| Subject | Re: [RFC] cgroup TODOs | From | Peter Zijlstra <> | Date | Fri, 14 Sep 2012 13:15:02 +0200 |
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On Thu, 2012-09-13 at 13:58 -0700, Tejun Heo wrote: > The cpu ones handle nesting correctly - parent's accounting includes > children's, parent's configuration affects children's unless > explicitly overridden, and children's limits nest inside parent's.
The implementation has some issues with fixed point math limitations on deep hierarchies/large cpu count, but yes.
Doing soft-float/bignum just isn't going to be popular I guess ;-)
People also don't seem to understand that each extra cgroup carries a cost and that nested cgroups are more expensive still, even if the intermediate levels are mostly empty (libvirt is a good example of how not to do things).
Anyway, I guess what I'm saying is that we need to work on the awareness of cost associated with all this cgroup nonsense, people seem to think its all good and free -- or not think at all, which, while depressing, seem the more likely option.
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